Indiana Science Grade 7

Chapter 15: Electronics and Computers

Section 1 Self-Check Quiz-Eng.

1.
An analog signal is created by __________.
A)a computer
B)a binary number series
C)digitization
D)an analog device
2.
Which of the following statements about analog signals is true?
A)Analog signals can have only certain values.
B)Analog signals vary smoothly with time.
C)Analog signals cannot be converted to digital signals.
D)Analog signals cannot be used to record music.
3.
Which of the following is an analog device?
A)television
B)CD player
C)digital watch
D)computer
4.
Which of the following elements is a semiconductor?
A)silicon
B)selenium
C)strontium
D)sodium
5.
Early televisions and radios were larger than their modern versions because they used __________.
A)vacuum tubes
B)semiconductors
C)silicon
D)transistors
6.
The electrical conductivity of semiconductor elements can be changed by adding __________.
A)analogs
B)digital signals
C)diodes
D)impurities
7.
A changing electric current that carries information is a(n) __________.
A)alternating current
B)electronic signal
C)direct current
D)magnetic tape
8.
An electric current is a flow of __________ from one place to another.
A)protons
B)electrons
C)neutrons
D)atoms
9.
Which of the following is a type of electronic signal?
A)diode
B)integrated
C)analog
D)binary
10.
Which of the following is NOT a solid-state component?
A)diode
B)vacuum tube
C)transistor
D)integrated circuit
11.
A(n) __________ is a semiconductor device that allows current to flow in only one direction.
A)transistor
B)integrated circuit
C)chip
D)diode
12.
A(n) __________ is a device that contains three layers of semiconductors and can be used as an electronic switch.
A)diode
B)analog
C)transistor
D)binary
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